Part A
AD7732BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6723 PCS
- Package
- TSSOP-28
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7738BRUZ and AD7732BRUZ share the same TSSOP-28 package, 24-bit sigma-delta architecture, and SPI-compatible serial interface, making them viable functional candidates in the same signal chain. However, the AD7738BRUZ provides eight single-ended or four differential input channels versus two differential channels on the AD7732BRUZ, and their throughput rates and analog input ranges differ. Designers must validate channel count requirements, data rate, and input range against the target application before substituting one for the other.
Package Type
High match
Resolution
High match
Channel Count
Validation required
Throughput Rate
Validation required
Parts at a glance
Part B
AD7738BRUZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5636 PCS
- Package
- TSSOP-28
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7738BRUZ | AD7732BRUZ | Why it matters |
|---|---|---|---|
| Number of Input Channels | 8 (single-ended) / 4 (differential) | 2 (differential) | Channel count determines how many sensor signals can be measured by a single device; the AD7738 supports more channels, so it is not a drop-in replacement where 8 channels are required. |
| Resolution | 24-bit | 24-bit | Both provide 24-bit sigma-delta conversion, so resolution is equivalent and does not limit substitutability. |
| Maximum Output Data Rate | 15.4 kSPS | 15.4 kSPS | Identical maximum throughput means both can handle the same signal bandwidth and update-rate requirements. |
| Interface Type | SPI / 3-wire serial | SPI / 3-wire serial | Matching serial interfaces allow either part to connect to the same host microcontroller without protocol changes. |
| Supply Voltage (Analog) | 5 V | 5 V | Same analog supply requirement means the power rail design can be reused when swapping parts. |
| Package | 28-lead TSSOP | 28-lead TSSOP | Identical package and pin count simplify PCB layout compatibility, though pinout must still be verified. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Same industrial temperature range ensures both parts meet the same environmental requirements. |
| Input Type | Single-ended and differential | Differential only | The AD7738 supports single-ended inputs while the AD7732 is differential-only, which affects sensor wiring and signal conditioning flexibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7732BRUZ | AD7738BRUZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 15.4k | 15.4k |
| Number of Inputs | 2 | 4, 8 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
| Features | - | True Bipolar |
Frequently asked questions
What are the key architectural differences between the AD7738BRUZ and AD7732BRUZ?
The AD7738BRUZ is an 8-channel, 24-bit sigma-delta ADC with a maximum throughput of 15.4 kSPS, while the AD7732BRUZ is a 2-channel, 24-bit sigma-delta ADC with a maximum throughput of 15.4 kSPS. The AD7738 provides eight single-ended or four differential input channels, whereas the AD7732 provides two differential input channels. Both devices share the same sigma-delta core architecture and serial interface family but differ in channel count and input configuration.
Are the AD7738BRUZ and AD7732BRUZ pin-compatible?
No. Both devices are offered in a 28-lead TSSOP (RU-28) package, but the pin functions differ because the AD7738 supports eight input channels and the AD7732 supports two differential channels. The analog input pin assignments and channel-related control pins are not identical, so the PCB layout must be designed specifically for each part. They should not be treated as drop-in replacements.
What is the resolution and throughput of each device?
Both the AD7738BRUZ and AD7732BRUZ are 24-bit sigma-delta ADCs. The AD7738BRUZ offers programmable output update rates up to 15.4 kSPS, and the AD7732BRUZ also supports output update rates up to 15.4 kSPS. Resolution in effective bits depends on the selected filter word, update rate, and gain setting, as specified in the respective Analog Devices datasheets.
How do the input channel configurations differ?
The AD7738BRUZ provides eight single-ended inputs or four fully differential inputs, selectable through configuration. The AD7732BRUZ provides two fully differential input channels. For applications requiring more analog input channels in a single package, the AD7738BRUZ is the appropriate choice; for two-channel differential measurement, the AD7732BRUZ is sufficient.
Do both parts support the same serial interface and supply requirements?
Both devices use a serial interface compatible with SPI/QSPI/MICROWIRE/DSP standards and operate from a single 5 V analog supply with a separate 3 V or 5 V digital supply, as documented in the Analog Devices datasheets. The interface timing and register maps are similar in family but must be verified against each specific datasheet before firmware reuse.
Can the AD7732BRUZ be used as a substitute for the AD7738BRUZ in an existing design?
Not directly. Although both are 24-bit sigma-delta ADCs in the same 28-lead TSSOP package family, the AD7732BRUZ has only two differential input channels versus the AD7738BRUZ's eight single-ended/four differential channels, and the pin assignments differ. Substitution requires a redesign of the analog input section, PCB layout, and firmware configuration, followed by validation against the target specifications.
Which device is better suited for multi-channel data acquisition?
The AD7738BRUZ is better suited for multi-channel data acquisition because it integrates eight single-ended or four differential input channels in a single package, reducing external multiplexing requirements. The AD7732BRUZ, with two differential channels, is better suited to lower-channel-count precision measurement applications where board space and channel count requirements are modest.